(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.Date of event has been estimated.Date of implant has been estimated.The device was not returned for evaluation.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.A conclusive cause for the reported patient effects, and the relationship to the product, if any, cannot be determined.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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